Open Systems Adapter

The Open Systems Adapter (OSA) is a network controller for IBM z/Architecture, ES/9000 and S/390 mainframes. The OSA supports Ethernet, Token Ring and FDDI connectivity.[1][2]

References
  1. IBM Redbook - Local Area Network Concepts and Products
  2. IBM Redbook - Networking with z/OS and Cisco Routers: An Interoperability Guide
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